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Verified answer
Jawabx² + y² + 4x y - 12y = 0
2x + 2yy' + 4y + 4xy' - 12y' = 0
y' (2y + 4x -12) + 2x + 4y = 0
y' (2y + 4x- 12) = - 2x - 4y
y' = (- 2x - 4y)/(2y + 4x -12)
titik (x,y)=(2,1)
y' = [ -2(2) - 4(1) ] / [2(1) + 4(2) -12]
y'= [ -4 - 4 ] / [ 2 + 8 - 12]
y' = (-8)/(-2)
y' = 4